Muse Code

checkout / address.ts

checkout/
  address.ts
  submit-order.ts
  checkout.test.ts

Locate the address form and the validation logic it calls.

A reproducible failure

Input: apartment = ""
Expected: address accepted
Observed: address rejected

An empty apartment field is rejected even though it is optional.

A focused correction

const apartment = input.apartment.trim();
const address = {
  ...requiredFields,
  apartment: apartment || undefined,
};

Treat the optional field as absent when it contains no text.

Check both paths

✓ accepts an apartment number
✓ accepts an empty optional field
✓ still rejects missing required fields

Check an address with an apartment, and one without it.

Ready for a person to review

Changed: address normalization
Checked: required + optional fields
Next: human review

Review the diff, the tests and the browser behavior before merging.